Edwin g



E. C. ANDERSON.

WARM AIR FURNACE.

APPLICATLQN FILED JULY 1,4. |5919;

IafeILfeL Dec. 2, 1919.

l=. H Skil n i EDWIN C. ANDERSON, OF ST. LOUIS, MISSOURI, ASSIGNOR IOTHE BUCKS STOVE 8c VRANGE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATIONOF MISSOURI.

WARM-AIR runimcn.

To all whom t may concern:

Be it known that I, EDWIN C. ANDERSON, a citizen of the United States,residing at St. Louis, Missouri, have invented a certain new and usefulImprovement in farm-Air Furnaces, of which the following is a full,clear, and exact description, such as will ein ble others skilled intheart to which it appertains to make and use the same. f

rihis invention relates to warm air furnaces ofthe type in which thesmoke pipe leading from the combustion chamber passes through a cold airchamber through which cold air or cool air circulates when the furnaceis in operation. Y

The main object of my invention isto provide a warm air furnace of thegeneral type referred to which is so constructed that the cool air orunheated air in the cold air chamber will not come in contact with thesmoke pipe leading from the combustion chamber, thereby insuring aproper circulation of airin the cold air chamber, due to the fact thatthe temperature of the inflowing cold air is not increased by the heatwhich radiates from the smoke pipe. K

Another object is to provide a warm air furnaceV of the general typereferredv to which is equipped with means for conserving and `utilizingthe heaty that radiates from the portion of the smoke pipe that passesthrough the cold air lchamber of the furnace through which the infloWingair circulates. Other objects and desirable features of my inventionwill be hereinafter pointed out. v

Figure l of the drawings is a perspective view, partly broken away, of aportion of a warm air furnace constructed in accordance Y with myinvention.

Fig. 2 is a vertical sectional view of a portion of said furnace.

Fig. 8 is a horizontal sectional view, taken on approximately the line 33 of Fig. 2; and Fio'. 4C is a vertical longitudinal sectional view ofone side of the furnace.r

Referring to the drawings which illustratethe preferred form of myinvention, A designates the outer casing of my improved furnace and vBdesignates an innerl casing which is arranged inside of the casing A andspaced away therefrom so as to forma cold air chamber downthrough whichcold air circulates, as indicated by the Specification of IiettersPatent.

arrows in FiO'. 2, when the furnace is in operation, said cold airpassing into the lower end of an air heating chamber 3'/ and Vthencecirculating upwardly through said heating chamber, as indicated by thearrows in Fig. 2. `The smoke pipe @that leads from the combustionchamber ofthe furnace prcjects'laterally through the inner casing B andthrough the outer casing A, thereby causing' a portion of said smokepipe to be located inthe space between the inner and outer casings ofthefurnace. In the form of my inventionherein illustrated the smoke pipe Cis provided with a depending portion C that cnstitutes a diving Hue thatlies in the space between the inner casing B and outer casing A, but itis immaterial whether or not the smoke pipe is provided with a divingflue. Y

In order to prevent the cold air in the cold air chamber from beingheated by the heat which radiates from the smoke pipe, I

have constructed the furnace in such a manv ner that the iniiowing coldair is prevented y Patented Dec. 2, agit?. Application led July 14,1919. SerialNo. 310,734. Y I Y from coming in Contact with the portionof f the smoke pipe that liesin the space between the inner and outercasings of the furnace. Various means can vbe used for accomplishingthis desirable result, but one convenient way of constructing thefurnace is to incase the smoke pipe C and the depending portion C ofsaine in a chamber e formed by a housing arranged between `the inner andouter casings of the furnace and provided with two vertical side wallsl, a top wall 2 and a bottonik wall 3, as shown in Figs. 2 and 3. Thewalls of said housing can lbe connected in any suitable manner to theouter casing A. and inner casing B of the furnace, and the opening inthe inner casing B, through which the smoke pipe anddiving. iiue projectis preferably made large enough so as to form an unobstructed passagewayoetween the air heating chamber y and the chamber c that surrounds thesmoke pipe, thereby causing the heat that radiates from the smoke pipeto be conserved and returned to the heating chamber g/ where it isutilized.

A warm air furnace of the construction above described lis moreefficient than the furnaces of this generall type heretofore in use, inthat there is no liability of the heat cold' air chainber a', and thus,raising the Vtemperature of said'air to such an extent that it does notcirculate properly through the cold-air chamber w. Such a furnace notonly insures the airinatlie cold'air chamber e being kept cool, but italso conserves and utilizes the heat which radiates frein the' portionof the sinoke pipe that is locatedin i the lspace,between'the'iiiner andouter cas-` ings of the furnace, My invention is applicable to any typeof Warin air furnace in vwhich the smoke `pipe from the coinbustionychamber extends-through the passage- 'ivay through which cold .air isadinitted to the aiiheating chainber of the furnace; it is iininaterialWhether or not the sinoke pipe is provided with a diving flue and theparticul lar lconstruction of the. housing` that incases the snioke pipeis iininaterial, so long as it V.prevents the infloiving cold airfroincoinpassageway through which cold air is ad-V mitted to Vthe airheating chamber of the furnace, a smoke pipehaving a Vportion arlrangedin saidpassageway, and-means for preventing/the infiowing coldairV in Asaid )assao'eiva f' from coinin in contact with said sinokepipe. i I 2, Warin an* furnace provided ivitha passageway throughV whichcold'- air is'adinitted to -the airrlieating chainber 'of theYV furnace,asinoke pipe having a i portion arranged in said passageway, ineans forpreventing the; inflowing cold airin said `passaoeway vfroni comingY incontact with said-sinoke pipe, vand n'ieans forV conserving andutilizing' the heat that radiates froin the portion of the sinoke pipearranged in said passageway c v 3. A Wariniair furnace, comprising' anlinner casing and an'outer casing spaced apart Vso as 'to' forniacold'air chamber, a sinoke pipefleading. froni the combustion chamberof the furnacel Vand projecting laterally through said ca'sings, andineans "for preventing the cold air inj said` cold air charnpipe. Y

4. i Warni air furnace, comprising an inber froin coiiiin'gin contactwith said sinoke ner' casing and anioutei-"casiiig spaced apart so -asVto forni acold."airrchamber, a si'noke pipe leading from thecombustion,l chainber of the furnace *andv projecting laterallythrougli'said'casiiigs, ineaiis for preventing the coldfair in said coldair chainber frein i coniing contactvv'ith said sinoke pipe, and

jineans for conserving and utilizing the heat that radiates fronitheportion of the snioke pipe arranged in the space between the inner and'outer casing of the furnace.

5. A Warm air furnace, comprising an air rounding saidairlieatiiigchainber, a sinoke pipe leading fr cin the combustion chainberof theffuriiace and provided with Ia portion arranged in said coldairochaii-iber, and a Aheating chamber, a-,cold `air chainber surhousingin saidcold air chamber that inoases- Y said siiioke pipe and preventsthe-inflowing cold air Yfroni coiningin contact lwith saine.

6. A Warniair furnace, comprising an air heating. Vclianiber,a cold'-air chainber siii'- rouiiding said air heating chamber, a sinoke pipe'leading frein 4the combustion chaniber ofthe furnace and provided with aportion arranged-in said cold air chamber, a housing J in said coldairvchainberthat iucases said sinoke-Y pipe and prevents theinfloiviiigfcold air frein comingin contact with saine, and apassage-Way; from the interior of 1 said hous-VK ing to said air heatingchaniber.v ivf'. warni airV furnace, l'comprising an outer casing, Naninner casing arranged in# 11 side ofsaid outercasing and spaced awaytherefrom so'as to forni a cold air chainber down through which Acoldair circulates into theV lower end ofthe air: heating chainberformed-by: said inner casing,a sinoke pipe Y projecting laterallytliroughisaid inner andV Voutereasing and provided `with a diving. fluel locatedlprincipally in saidcold air chamber,

and a housing arranged between the `iiii'ierlV :aii'dvou-ter Vcasinigsvof thefurnace-for preventing the ini'ioiving cold air fifoni coiningincontact with' said snioke pipe and diving flue, thexi-iiner casingofthe furnace being y so constructed that the interiorofisaidA -lious-Vioo ing is in direct coininunicationwith the air heatingchaniber ofthefurnace. Y Y

EDWIN C. ANDERSON.

